## Function: COMMON-LISP:GET-MACRO-CHARACTER
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> Return the function associated with the specified CHAR which is a macro
> character, or NIL if there is no such function. As a second value, return
> T if CHAR is a macro character which is non-terminating, i.e. which can
> be embedded in a symbol name.

### Lambda list
```cl
(char &optional sb-impl::rt-designator)
```